Dead-latch.



0. K. TILLIVIAN.

DEAD LATCH.- I APPLICATION FILED AUG-9, IQIII I in?! Patented Apr. 30, 1918.

ORION K. 'EILLMAN, OF I-IORNER, WEST VIRGINIA.

DEAD-LATCH.

incense,

Specification of Letters Patent.

Original application filed June 8, 1917, Serial No. 173,589. Divided and this application filed August 9, 1917.

, Serial No. 185,322.

To all whom it may concern:

Be it known that l, ORION K. 'lILLMAN, a citizen of the United States, residing at l-lorner, in the county of Lewis and State of West Virginia, have invented certain new and useful Improvements in Dead-Latches, of which the following is a specification.

This invention is a dead latch, the present application being a division of an application filed by me June 8, 1917, Serial No. 173,589.

In the annexed drawings Figure 1 is an elevation of the latch with side of the casing removed,

Fig. 2 is an edge view of the latch,

Fig. 3 is a view similar to Fig. 1 with the parts in a different position, I

Fig. 4 is a perspective view.

The dead latch comprises a casing 25 secured to the inner'face of the door and constructed with openings 26 to register with the openings provided in the door and the lock case 4 for the knob spindle. Within this case a hub 27 is secured upon the knob spindle 5 and this hub plays within an opening 28 in a gravitating holding member 29, a notch 30 being provided in the forward end wall of the said opening to be engaged by a tooth or lug 31 on the said hub 27. The holding member 29 is a large weight resting upon the lower wall 32 of a recess 33 within the casing 25 and the said lower wall is inclined forwardly so that the weight of the member 29 will tend to retain it at the front end of the recess 33, as shown in Fig. 1, in which position the notch 30 will be out of engagement with the tooth or lug 31 and the knob spindle may rotate. A handle 34 is fixed in the lower edge of the holding block or plate 29 and projects through a slot/35 in the lower wall of the casing 25 so that the holding body may be shifted from one end to the other end of the casing, and the said slot also serves as an escape opening for any dust or dirt which may work into the casing and tend to collect therein. It will be readily understood that when it is desired to hold the latch bolt against opening movement, the handle 34 is pushed toward the inner end of the casing 25 and the notch 30 thereby brought into engagement with the lug 31, as'clearly shown in Fig. 3, so that vented inasmuch as the upper and lower of the recess 33. To hold theplate or block 29 in either of its set positions, I provide a thumb lever 36 which is pivotally mounted at 37 in the upper portion of the casing 25 and has its inner corner projecting through the top of the casing and suitably shaped for convenient engagement by a thumb or finger. Upon the lower edge of this thumb lever, at the free end thereof, it provide a depending tooth 38 which is adapted to engage a notch 39 in the upper edge oitthe holding block 29 or rest in the recess 4L0 at the upper inner corner of said block, the first-describcd position being illustrated in Fig. 3, while the last-described position is illustrated in Fig. 1. It will be readily understood that this construction permits the dead latch to be set or released as may be desired and it will be held in either po sition until the parts are manually manipulated from the interior of the building.

Having thus described the invention, what is claimed as new is: V 1. In a lock, the combination of a s1idable bolt, a spindle adapted to-actuate said bolt, a projection on said spindle, a slidable.

with a plurality of notches, and a thumb lever mounted above said member and provided on its under side with a projection adapted to engage either notch in the upper edge of the holding member and thereby hold the said member in or out of engagement with the knob spindle. V

2. In a lock, the combination of a lock case, a slidable bolt mounted therein, a spindle arranged to actuate said bolt, a projection 011 said spindle, a gravitating holding body having an internal opening through which the spindle passes, a notch at one end of said opening to engage the projection on the spindle, a handle depending from said member, and a thumb lever mounted above the member and adapted to engage the same onion n. 'rinnnnn- [n 3.

topics or this patent may be obtained for five cents each, by addressing the "Commissioner or itatentu,

treatmen i Patented a so, rails, 

